Balancing means for pumps



June 12, 1923.

N. A. MESSINGER BALANCING MEANS FOR PUMPS 1920 2 Sheets-Sheef 1 OriginalFiled July 10 June 12, 1923.

N. A. MESSINGER BALANCING MEANS FOR PUMPS 2 Sheets-Sheet Z 2!!! I IIIIIIIII! Original Filed July 10 1920 enema dune t2, teas.

ans er NQBMAN A. MESSENGER, F EASTON, PENNSYLVANIA, ASSIGNOE TOPENNSYLVANIA PUMP AND COMPRESSOR 00., 0F EASTON, PENNSYLVANIA, ACORPORATION OF PENNSYLVANIA.

BALANGING MEANS FOR PUMPS.

Application filed July 10, 1920, Serial No. 395,239. Renewed April 4,1922. Seriallto. 549,500.

To all whom it may concern:

Be it known that I, NORMAN A. MEssIN- can, a citizen of the UnitedStates, residing at Easton, in the county of Northampton and State ofPennsylvania, have invented a certain new and useful Improvement inBalancing Means for Pumps, of which the following is a specification.

This invention relates to centrifugal to pumps and in particular to apump in which the impeller is balanced, so that it will not be forcedtoward either end of the pump due to variation of pressure on eitherside of the impeller suction opening.

One of the objects of the present invention is to provide means tocompletely balance the pressure on either side of the impeller orimpellers, the means provided being simple, eflicient and without movingparts.

Another object of the invention is to provide --balancing meanscontained wholly within the casm of the pum and not requiring the impeler to .be per orated to permit fluid to pass through the impeller ashas been the usual practice in single suction, single stage ormulti-stage types of centrifugal pumps.

Another object of the invention is to provide the balancing means in theform of a passage or conduit contained within one of the casings, andextending from one side of the impeller to the other so that the fluidin the area directly opposite the suction inlet ma flow around theimpeller to the suction or intake side of the, pump.

It is an important object of the present invention to provide thebalancing conduit in one of the principal parts or halves of the pumpeasin so that there will be no break in the con uit at the joint betweenthe upper and lower parts of the casing. Also it is an object to so formthe conduit that it will be independent of the normal passages of thepump through which the fluid is forced between successive impellers, orbetween the suction and discharged passages so that the only flow offluid through the balancing conduit is that necessary to provide properbalancing.

With the above and other objects in view, my invention consists in thefeatures of construction and operation set forth in the followingspecification and illustrated in the accompanying drawings, forming apart hereof.

In .the accompanying drawings, 1 have shown one embodiment of theinvention which I noW deem preferable, but it is to be understood thatchanges and modifications may be made within the scope of the appendedclaims without departing from the spirit of the invention.

In the drawings- Fig. 1 shows a transverse section through one form ofthe invention.

Fig. 2 shows a plan view of a pump casing provided with thepresentinvention.

Fig. 3-shows a section taken on line 3-3 of Fig. 2.

Fig. 4 shows a section taken on line 4-4 of Fig. 2.

Fig. 5 shows a longitudinal section of the pump shown in Figs. 2 and 3.

It is to be understood that the present showing and description disclosebut one specific embodiment of the invention and that other forms andmodifications are in.-

eluded within the spirit and scope of the invention as expressed in theappended claims. As illustrated in the above mentioned drawings, theembodiment of the invention selected for illustration in its entiretycomprises the following rincipal parts: first, a pum casing; second animpeller therein; thir discharge passages extending through the casingand impeller or impellers; and fourth, a conduit within the casing andindependent of the normal flow passages, connecting the area on oppositesides of the im eller.

rimarily my invention consists in a conduit extendin between andconnecting the areas within t e impeller rings in the casing so thatfluid may flow from one side to the other of the impeller to equalizethe pressures pressing against the sides of the impeller or impellerswithin the area included within the impeller rings. One of theseconduits is provided for each of the stages or sections of the pump whenthe pump has more than one stage. H

Referring more in detail to the drawings it will be seen that a casingfor a single impeller of the double or balanced intake type has beenprovided. This type tends to balance the pressures on either side of theimpeller, but, due to inequalities in the veloci- I The lower casing 50is provided with both intake passages 53 and the discharge connection 52connecting with the volute 52". Within these casings in a suitablecentral opening 54 the balanced impeller 16 is adapted to be rotatablymounted. This impeller 16 is fastened to central shaft 17 and issupported in suitable bearings on either side.

Passing through the intake passage 53 the fluid passes into the area 55adjacent the centre of the casing on either side of the centraltransverse opening 54 in which the impeller rotates. The conduit 56connects these two areas, the orifices of the conduit being shown at 57.This conduit provides a passage extending entirely within the lowerhalfcasing for the fluid to pass from one side to the other of theintake areas 55.

7 Normally there will be but little velocity of the fluid through thispassage, only enough to equalize the pressures in either of the intakeareas 55. I

The orifices are so placed for the conduits 56 that the normal intakevelocity of the fluid entering the areas 55 does not enter the conduit56, the main purpose of the conduit 56 being to provide a conduitindependent of the velocity passages of the pump through which the fluidmay circulate to equalize the static pressure on either side of theimpellers. a

The described embodiment of the invention is but one of the forms whichmy invention may assume and it is to be understood that any form' ofpump of single or multiple stage type may be provided with a balancingmeans within the spirit of the present invention.

What I claim is 1. A balancing means for centrifugal pumps comprising incombination, a pump casing, a double impeller having intake areas onopposite sides therein,- and a conduit formed within the parts of saidcasing ex tending from one side of the casing to the other and havingorifices adjacent the intake areas on either side of said casing.

2. A balancing means for centrifugal pumps comprising in combination, apump casing, a double impeller having intake areas on opposite sidestherein, and a conduit formed within the parts of said casingindependent of the normal flow passages and extending from one side ofthe casing to the other and having orifices adjacent the intake areas oneither side of said casing.

3. A balancing means for centrifugal pumps comprising in combination, apump casing, a double impeller having intake areas on opposite sidestherein, flanges on said impeller, and a conduit formed within the partsof said casing extending from one side of the casing to the other havingorifices adjacent the intake areas and adjacent the annular flanges ofthe impeller on either side of said casing.

In testimony whereof, I have hereunto set my hand.-

NORMAN A; MESSINGER.

